This Article Abstract Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Alert me to new issues of the journal Add to Saved Citations Download to citation manager Request Permissions Request Reprints Add to My Marked Citations Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Citing Articles via Scopus Google Scholar Articles by Mackert, J.R. Articles by Beauchamp, R.H. Search for Related Content PubMed Articles by Mackert, J.R., Jr Articles by Beauchamp, R.H. Social Bookmarking                         What's this?

Ultrathinning Dental Porcelain for Transmitted Light Microscopy

Dental Materials Laboratory, School of Dentistry, Medical College of Georgia, Augusta, Georgia 30912

M.B. Butts

G.M. Beaudreau

Dental Materials Laboratory, School of Dentistry, Medical College of Georgia, Augusta, Georgia 30912

C.W. Fairhurst

Dental Materials Laboratory, School of Dentistry, Medical College of Georgia, Augusta, Georgia 30912

R.H. Beauchamp

Battelle Pacific Northwest Laboratories, Richland, Washington 99352

A technique for ultrathinning brittle materials, originally developed at Battelle Pacific Northwest Labs for examination of lunar materials, has been successfully adapted for the preparation of dental porcelain specimens. A commercial dental porcelain and "Component No. 1" of the Weinstein et al. patent were ultrathinned using this technique. Each material was examined in the unfired powder form, after one firing, and after five firings. The sections were typically from 2 to 6 µm thick. The ultrathinned specimens were then examined using transmitted light microscopy. Identical areas of fired porcelain specimens were also examined by reflected light microscopy, scanning electron microscopy, and transmitted light microscopy of ultrathinned specimens in order to compare the three techniques. The porcelain powder and each frit were analyzed by x-ray diffractometry (XRD). Leucite (K₂O·Al₂O₃·4SiO₂) was detected by XRD in the commercial porcelain and the Component No. 1 frit. Optical micrographs of the ultrathinned specimens revealed a second phase within the glassy frit particles of the commercial porcelain and the Component No. 1 material. No phase changes between unfired and fired specimens were detected by XRD. This success in ultrathinning dental porcelains provides a significant improvement in the ability to resolve the constituent phases of these materials relative to standard petrographic techniques and a useful addition to the techniques available for microstructural examination of dental porcelain.

REFERENCES

• Beauchamp, R.H. and Williford, J.F. (1974): Metallographic Methods Applied to Ultrathinning Lunar Rocks, Meteorites, Fossils, and Other Brittle Materials for Optical Microscopy. In: Metallographic Specimen Preparation, J.L. McCall and W.M. Mueller, Eds., New York: Plenum Press, pp. 233-249.
• Beauchamp, R.H.; Williford, J.F.; and Gafford, E.C. (1972a): Exploratory Development and Services for Preparing and Examining Ultrathin Polished Sections of Lunar Rocks and Particulates, Part I, Battelle Pacific Northwest Laboratories Research Report, March 23, 1972.
• Beauchamp, R.H.; Williford, J.F.; and Gafford, E.C. (1972b): Exploratory Development and Services for Preparing and Examining Ultrathin Polished Sections of Lunar Rocks and Particulates, Part II, Battelle Pacific Northwest Laboratories Research Report, March 23, 1972.
• Burk, B. and Burnett, A.P. (1978): Leucite-Containing Porcelains and Method of Making Same. U.S. Patent #4101330, July 18, 1978.
• Chamot, E.M. and Mason, C.W. (1938): Handbook of Chemical Microscopy, Vol. 1, 2nd ed., New York: John Wiley & Sons, pp. 360-375.
• Donney, J.D.H. and Ondik, H.M. (1973): Crystal Data Determinative Tables, Vol. II: Inorganic Compounds, 3rd ed., Washington, DC: U.S. Department of Commerce, pp. C-359, T-85.
• Fairhurst, C.W.; Anusavice, K.J.; Hashinger, D.T.; Ringle, R.D.; and Twiggs, S.W. (1980): Thermal Expansion of Dental Alloys and Porcelains, J Biomed Mater Res 14:435-446.[CrossRef][Medline] [Order article via Infotrieve]
• Kacicz, J.M. and Burnett, A.P. (1985): Characterization of Dental Porcelain by the Robinson Backscatter Technique, IADR Abst 64: No. 635.
• Weinstein, M.; Katz, S.; and Weinstein, A.B. (1962): Fused Porcelain-to-Metal Teeth, U.S. Patent #3052982, September 11, 1962.
• Winchell, A.N. and Winchell, H. (1964): The Microscopical Character of Artificial Inorganic Solid Substances: Optical Properties of Artificial Minerals, 3rd ed., New York: Academic Press.

Journal of Dental Research, Vol. 64, No. 9, 1170-1175 (1985)
DOI: 10.1177/00220345850640091601


CiteULike    Complore    Connotea    Del.icio.us    Digg    Reddit    Technorati    Twitter    What's this?

This article has been cited by other articles:

				J.R. Mackert Jr, E. Rueggeberg, P.E. Lockwood, A.L. Evans, and W.O. Thompson Isothermal Anneal Effect on Microcrack Density around Leucite Particles in Dental Porcelain Journal of Dental Research, June 1, 1994; 73(6): 1221 - 1227. [Abstract] [PDF]

This Article Abstract Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Alert me to new issues of the journal Add to Saved Citations Download to citation manager Request Permissions Request Reprints Add to My Marked Citations Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Citing Articles via Scopus Google Scholar Articles by Mackert, J.R. Articles by Beauchamp, R.H. Search for Related Content PubMed Articles by Mackert, J.R., Jr Articles by Beauchamp, R.H. Social Bookmarking                         What's this?